Best Voice Calling API & SDK Providers
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Compare the Top Voice Calling API & SDK Providers as of March 2026
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What are Voice Calling API & SDK Providers?
Voice calling API and SDK providers offer developers with the necessary tools to integrate voice calling functionality into their applications. These providers typically offer a range of options, including APIs that allow for an easy integration process, as well as SDKs that provide more advanced features such as call recording and real-time transcription. They also often provide comprehensive documentation and technical support to assist developers in implementing these services. Some of the major players in this field include Twilio, Voximplant, and Nexmo, each offering their own unique set of features and pricing plans. In general, these providers aim to make it easier for businesses to incorporate voice calling capabilities into their products without having to build them from scratch. Compare and read user reviews of the best Voice Calling API & SDK providers currently available using the table below. This list is updated regularly.
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1
AVOXI
AVOXI
The effective, affordable, and easy-to-use cloud-based call center software, AVOXI Genius. Easily manage your business communications from an intuitive, web-based contact center. AVOXI Genius is the first platform to integrate your contact center solution with your voice service, with virtual phone numbers available for instant activation in 170+ countries. With plans starting at $19.99 per user, AVOXI Genius is one of the most affordable solutions worldwide! Get 2 months free--limited time only.Starting Price: $19.99/month/user -
2
TENIOS
TENIOS
TENIOS is a German-based communications provider specializing in advanced AI phone assistant and telephony solutions for businesses. Their comprehensive telecom-platform offers services such as virtual phone numbers, intelligent call routing, interactive voice response (IVR) systems, SMS, RCS, and a robust Voice API for seamless integration of voice applications. TENIOS also provides AI-powered phone assistants to automate customer interactions, enhancing efficiency in contact centers and diverse sectors with high call volumes. With over two decades of experience and hosting in Germany, TENIOS ensures reliable and scalable communication solutions tailored to meet diverse business needs.Starting Price: €50/ month (Pay as YouGo) -
3
Twilio Voice
Twilio
Create a scalable voice experience with the API that connects millions globally. With Twilio Voice, you can build unique phone call experiences with one API, to create, receive, control and monitor calls with just a few lines of code. Create an engaging voice experience that you can quickly scale and modify with a wide array of customization options and resources, like our Voice SDK. Then, add on features like Interactive Voice Response (IVR), recording transcriptions, and speech recognition to create an experience that your customers will appreciate. Whether you're looking to set up global conferencing or alerts & notifications, Twilio has the support you need for building with Voice. Find docs, code samples, helper libraries, and developer tools such as Twilio Runtime and our visual workflow builder, Studio.Starting Price: $0.0085 per min -
4
Exotel
Exotel
Exotel is a secure and reliable business phone system on the cloud. Simple to setup. No additional infrastructure or equipment required. Enables sales and support teams irrespective of where they work from. Build a personalized calling experience for your customers. Track, manage and build call flows using Exotel with our drag-drop builder. Set up SMS campaigns with ease. We promise you the best delivery rates. Delivery to over 190 countries. User verification made seamless over calls & SMS. Non intrusive, with the best success rates. Make it easy for your agents to make sales calls to prospective customers. Automated dialers, integrations with CRMs, etc. make it a productive experience for your sales teams. -
5
Apidaze
Apidaze
Add real-time voice, video, messaging, and more into your VoIP, web, and mobile services. No CapEx. No contracts. Pay as you grow. 100% freedom to build what you want. Handle inbound or outbound calling seamlessly with Apidaze’s Voice APIs. There is no need for complex phone systems, or commitments with large carriers. Apidaze gives you access to phone numbers in more than 8,000 cities in 60 different countries. Create simple IVRs without the need for a phone system. Play a welcome message to the caller and route the call to different people depending on the caller’s input. With 6,000,000,000 SMS being sent each day in the US, SMS has quickly become an important communication medium to keep in touch with your customers.
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